Has this been mentioned recently? Can't see anything. But here is an
interesting article:
http://www.strategyinformer.com/news/1482/blizzard-set-to-unveil-new-title-at-wo
rldwide-invitational

Don't get excited, it's probably just Blizzard playing up to the crowd
and they're just going to announce the release of WotLK (expansion for
WoW), but rumours are certainly circulating again about D3. Not that
that's anything new, people have been claiming for years that it's
"just round the corner". Who knows, maybe we'll be lucky this time.
One thing's for sure, Blizzard are good at creating hype!

~~
Quote from the website:
Many rumours recently sparked up when Blizzard launched a new splash
page on its official website, now VP of design, Rob Pardo, has
confirmed that there will be a big announcement at Blizzard's
Worldwide Invitational in Paris, and that it could be about a new
title.

At this years GDC Paris, Pardo was asked if he could talk more about
the Diablo 3 rumours, and said that; “So you want me to announce the
game before our announcement?" he said. "No offense, but I think
there's like 300 people here, and I'll be ripped apart by 8000 people
there (at the Invitational) if I pre-announce it - but it's going to
be really exciting. I think everybody here will be really excited
about the announcement.”

Could we finally be close to a Diablo 3 announcement? Let's keep our
fingers crossed and hope for the best.